We now briefly describe the structure and functionality of a query processor — a process that transforms and executes a user-defined query against a database state and returns those instances that satisfy the query.

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Wenowbrieflydescribethestructureandfunctionalityofaqueryprocessor—aprocessthattransformsandexecutesauser-definedqueryagainstadatabasestateandreturnsthoseinstancesthatsatisfythequery.